https://bugs.llvm.org/show_bug.cgi?id=44005
Bug ID: 44005
Summary: lambda expression in template argument fails
Product: clang
Version: 9.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++2a
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
The below example is accepted with g++ -std=c++2a:
---
template <auto O>
struct B {
static constexpr int off = O();
};
struct A {
char a;
B<[](){ return 0; }> b;
};
---
But with clang there is an error:
---
$ clang++ -std=c++2a -o offs1 offs1.cpp
offs1.cpp:11:7: error: a lambda expression cannot appear in this context
B<[](){ return 0; }> b;
^
offs1.cpp:11:7: error: a non-type template parameter cannot have type
'A::(lambda at offs1.cpp:11:7)'
offs1.cpp:4:16: note: template parameter is declared here
template <auto O>
^
2 errors generated.
---
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